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Direct memory is still ram.

In our set up we have 8gb ram , giving mm process (128mb heap and 1gb direct memory )and spinning 5 peon tasks with ( 512mb heap and 4gb direct memory each) how does it work . does mm not use full direct memory at a time?

I’d suggest that you review https://druid.apache.org/docs/latest/operations/basic-cluster-tuning.html#direct-memory-sizing . You will have Direct Memory for both Historicals and MMs

also note that in Druid 25 (the latest release) you can start druid via the

bin/start-druid

script and it will automatically determine reasonable configs given the available resources on the server